Hi to all!
I can unfortunately confirm this "unknown main item tag 0x0" error also for 
Kubuntu 20.04 and kernel 5.11.0-27. The used hardware is an Apple Magic Mouse 2 
at an iMac8,1. It should be noted that Kubuntu is running in native (U)EFI 
mode, not in legacy CSM Bios-emulation. Maybe this fact has here some 
relevance. The coresponding dmesg output regarding this issue looks as follows:

[   90.797431] hid-generic 0005:004C:0269.0007: unknown main item tag 0x0
[   90.797529] input: Franzs Maus Mouse as 
/devices/pci0000:00/0000:00:1d.0/usb5/5-2/5-2.3/5-2.3:1.0/bluetooth/hci0/hci0:11/0005:004C:0269.0007/input/input12
[   90.797780] input: Franzs Maus as 
/devices/pci0000:00/0000:00:1d.0/usb5/5-2/5-2.3/5-2.3:1.0/bluetooth/hci0/hci0:11/0005:004C:0269.0007/input/input13
[   90.797871] hid-generic 0005:004C:0269.0007: input,hidraw3: BLUETOOTH HID 
v0.70 Mouse [Franzs Maus] on 60:f8:1d:ad:62:e1
[   90.873387] magicmouse 0005:004C:0269.0007: unknown main item tag 0x0
[   90.873514] input: Franzs Maus as 
/devices/pci0000:00/0000:00:1d.0/usb5/5-2/5-2.3/5-2.3:1.0/bluetooth/hci0/hci0:11/0005:004C:0269.0007/input/input14
[   90.873768] magicmouse 0005:004C:0269.0007: input,hidraw3: BLUETOOTH HID 
v0.70 Mouse [Franzs Maus] on 60:f8:1d:ad:62:e1
[   90.973119] hid-generic 0005:004C:0269.0007: unknown main item tag 0x0
[   90.973202] input: Franzs Maus Mouse as 
/devices/pci0000:00/0000:00:1d.0/usb5/5-2/5-2.3/5-2.3:1.0/bluetooth/hci0/hci0:11/0005:004C:0269.0007/input/input15
[   90.973321] input: Franzs Maus as 
/devices/pci0000:00/0000:00:1d.0/usb5/5-2/5-2.3/5-2.3:1.0/bluetooth/hci0/hci0:11/0005:004C:0269.0007/input/input16
[   90.973390] hid-generic 0005:004C:0269.0007: input,hidraw3: BLUETOOTH HID 
v0.70 Mouse [Franzs Maus] on 60:f8:1d:ad:62:e1
[   93.041395] magicmouse 0005:004C:0269.0007: unknown main item tag 0x0
[   93.041508] input: Franzs Maus as 
/devices/pci0000:00/0000:00:1d.0/usb5/5-2/5-2.3/5-2.3:1.0/bluetooth/hci0/hci0:11/0005:004C:0269.0007/input/input17
[   93.041685] magicmouse 0005:004C:0269.0007: input,hidraw3: BLUETOOTH HID 
v0.70 Mouse [Franzs Maus] on 60:f8:1d:ad:62:e1

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https://bugs.launchpad.net/bugs/1834085

Title:
  Bluetooth touchpad (Apple Magic Trackpad) disconnects every few
  minutes

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